Fix/add tcp port support

[pgte]

Fixes #37

[ghost]

Thanks! Could you also update the readme? Need to kill those addresses before people start using them :P

I'm also thinking it's okay to completely remove the no-/tcp support here since there's no backwards-compat concerns as with the webrtc transport, but that's @diasdavid's call I guess :)

[daviddias]

I'm also thinking it's okay to completely remove the no-/tcp support here since there's no backwards-compat concerns as with the webrtc transport, but that's @diasdavid's call I guess :)

I would be fine with both but you do bring a good point and since we have the chance, let's do as @lgierth suggests.

[pgte]

@lgierth docs: done by d2037bc.

deprecate no-tcp: I think this line enforces that.

[pgte]

Tests are failing because of this issue on aegis: ipfs/aegir#177

[daviddias]

Can we have that test skipped for now so that CI is green but with a comment above pointing to the issue reporting the problem? Thank you!

[daviddias]

@pgte now it fails because of linting https://travis-ci.org/libp2p/js-libp2p-websocket-star/jobs/309424155#L2297